In another attempt to break the world record for stupid, many people have tweeted, facebooked, or instagrammed pictures of their debit cards for one reason or another. Their defense? You can't see the PIN or security code!

Okay, let's break this down. For starters, when was the last time you made an online transaction and the seller required your PIN? I'd bet it's somewhere between "not even once" and "never." That leaves us with the three-digit security code on the back. Call me crazy, but 999 potential security code options isn't that many. A dedicated thief could easily figure out your security code in a matter of hours using pure trial and error.